Nikwax says about the Tech Wash
For cleaning outdoor gear. Technical cleaner for outdoor clothing and synthetic sleeping bags. Cleans effectively, restores water repellency and revives breathability. Revives the performance of your gear, keeping you warmer and drier. Recommended for Gore-Tex®, Windstopper®, Nikwax Analogy® and all other waterproof, windproof and fleece clothing and gear.